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Nanosized cerium-manganese ferrite particles were prepared by co-precipitation approach. The structural evolutions and morphological characteristics of the nanopowder were investigated using X-ray diffractometry, transmission electron microscopy and thermo-gravimetry. XRD results showed that particles with crystallite size in nanometer scale were formed. TEM studies showed the morphology of the prepared cerium-manganese ferrite with a crystallite diameter of 20 nm at the calcination temperature of 500°C for 4 h. The catalyst showed high activities for SCR of nitric oxide with ammonia.

Abstract: Fe2O3/Al2O3 catalyst was prepared and the catalytic oxidation of toluene over the catalyst was investigated. The catalyst was prepared by wet impregnation of commercial alumina support. The support was impregnated with an aqueous solution of iron nitrate. The wet support was dried and calcined at 600-800 °C. The catalytic property of the catalyst was measured by the light-off curve of CO2 yield. All these catalysts were active for total oxidation of toluene above 250 °C. The catalytic activity of catalyst calcined at 600 °C was better than those of catalysts calcined at 700 and 800 °C.

Abstract: Ce-Ti-MoOx catalysts with different Mo contents have been prepared and used for selective catalytic reduction of NO with NH3 (NH3-SCR). As-prepared catalysts were characterized by N2 adsorption-desorption and XRD analysis. It was found that the Ce-Ti-MoOx catalyst with nominal MoO3 content of 10 % exhibited the best NH3-SCR activity, over 90 % of NO conversions could be obtained at 200 - 425 °C with GHSV of 100 000 h-1.